MIAMI — LeBron James had 26 points and 10 rebounds despite missing much of the second half with leg cramps, Dwyane Wade scored 29 points and the NBA champion Miami Heat beat the Boston Celtics, 120-107, on Tuesday night in the season opener for both teams.

Ray Allen, in his first game with Miami since leaving Boston over the summer, added 19 points for the Heat, as did Chris Bosh. Miami handed out its championship rings and raised the banner commemorating last season in a pregame ceremony replete with an indoor fireworks show.

Kyrie Irving scored 29 points, Anderson Varejao had a career-high 23 rebounds and Cleveland opened the season with a win over Washington.

Rookie Dion Waiters added 17 points for the Cavs, who led by 16 in the third quarter but needed big plays from Irving and Varejao in the final minutes to hold off the Wizards. Varejao had nine points and a career-high nine assists,setting up dunks by Tristan Thompson.

Jordan Crawford scored 11 points to lead the Wizards, who were without star point guard John Wall, power forward Nene and forward Kevin Seraphin. Wall, the former No. 1 overall pick, is expected to be out until late November with a knee injury.